zookeeper事件监听机制

[上海-后端-cccc]
**       **有大佬可以解释一下 zookeeper文档里面的这句话吗"a client will never see a change for which it has set a watch until it first sees the watch event."   
      上下文是  " ZooKeeper provides an ordering guarantee: a client will never see a change for which it has set a watch until it first sees the watch event. Network delays or other factors may cause different clients to see watches and return codes from updates at different times. The key point is that everything seen by the different clients will have a consistent order."

来源：云原生后端社区https://www.yuque.com/server_mind/answer